For thousands of years, humans moved, hunted, and gathered without the support of high-tech sneakers or arch-supporting foam. Today, the "barefoot movement" is making a massive comeback in gyms and on running trails worldwide. But is stripping off your shoes the secret to better performance, or a fast track to a stress fracture? The truth lies in your proprioception — your body’s ability to sense its position in space. This guide explores the "ground-up" science of barefoot t